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          ket: ["{\\left| {#1} \\right\\rangle}",1],
          bra: ["{\\left\\langle{#1}\\right|}",1],
          ketbra: ["{\\left|{#1}\\vphantom{#2}\\right\\rangle\\!\\left\\langle{#2}\\vphantom{#1}\\right|}",2],
          tensor: ["{\\boldsymbol{#1}}",1],
          dd: ["{\\frac{\\mathrm{d} #1 }{\\mathrm{d} #2 }}",2], // normal derivetives.
          pp: ["{\\frac{\\partial #1}{\\partial #2}}",2], // partial derivetives.
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